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LT3971A

更新时间： 2024-11-27 14:57:27
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
24页 352K
描述
具 2.2μA 静态电流的 38V、1.3A、2MHz 降压型稳压器

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中文翻译

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LT3971A 数据手册

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LT3971A/LT3971A-5  
38V, 1.3A, 2MHz  
Step-Down Regulator with  
2.2µA Quiescent Current  
DESCRIPTION  
FEATURES  
The LT®3971A is an adjustable frequency monolithic buck  
switchingregulatorthatacceptsawideinputvoltagerange  
up to 38V. Low quiescent current design consumes only  
2.8μAofsupplycurrentwhileregulatingwithnoload. Low  
ripple Burst Mode operation maintains high efficiency at  
low output currents while keeping the output ripple below  
15mV in a typical application. An internally compensated  
current mode topology is used for fast transient response  
and good loop stability. A high efficiency 0.33Ω switch  
is included on the die along with a boost Schottky diode  
and the necessary oscillator, control and logic circuitry.  
An accurate 1V threshold enable pin can be used to shut  
down the LT3971A, reducing the input supply current to  
700nA. A capacitor on the SS pin provides a controlled  
inrushcurrent(soft-start).Apowergoodflagsignalswhen  
n
Ultralow Quiescent Current:  
2.8μA I Regulating 12V to 3.3V  
Q
IN  
OUT  
n
n
Fixed Output Voltages: 5V  
2.2μA I Regulating 12V to 5V  
Q
IN  
OUT  
Low Ripple Burst Mode® Operation:  
Output Ripple < 15mV  
P-P  
n
n
n
n
n
n
n
n
n
n
n
n
Wide Input Voltage Range: 4.3V to 38V  
1.3A Maximum Output Current  
Adjustable Switching Frequency: 200kHz to 2MHz  
Synchronizable Between 250kHz to 2MHz  
Fast Transient Response  
Accurate 1V Enable Pin Threshold  
Low Shutdown Current: I = 700nA  
Q
Power Good Flag  
Soft-Start Capability  
Internal Compensation  
V
reaches91%oftheprogrammedoutputvoltage.The  
OUT  
Output Voltage: 1.19V to 30V  
Small Thermally Enhanced 10-Lead MSOP Package  
LT3971A is available in a small 10-lead MSOP package  
with an exposed pad for low thermal resistance.  
The LT3971A and LT3971A-5 have a more accurate ref-  
erence voltage compared to the LT3971 and LT3971-5.  
APPLICATIONS  
The LT3971A-5 also has specified V  
pin current and  
OUT  
n
USB VBUS Regulation  
ABSMAX current. These characteristics are important for  
USB applications.  
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
Automotive Battery Regulation  
Power for Portable Products  
n
n
Industrial Supplies  
TYPICAL APPLICATION  
No Load Supply Current  
3.0  
5.15V Step-Down Converter for USB Applications  
OUTPUT IN REGULATION  
V
IN  
6.3V TO 38V  
2.5  
V
IN  
LT3971A-5  
EN  
BOOST  
SW  
OFF ON  
4.7μF  
0.47μF  
10μH  
PG  
SS  
2.0  
1.5  
1.0  
LT3971A-5  
RT  
BD  
V
20k, 1%  
OUT  
5.15V  
1.3A  
V
OUT  
118k  
f = 400kHz  
SYNC GND  
715k  
1%  
47μF  
5
10  
15  
20  
25  
30  
35  
INPUT VOLTAGE (V)  
3971 TA01a  
3971A TA01b  
3971af  
1
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